31 Mar
2019
31 Mar
'19
12:19 p.m.
On Sun, Mar 17, 2019 at 06:24:58AM +0800, Yifeng Li wrote:
On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), rebooting with sm712fb framebuffer driver would cause the role of brightness up/down button to swap.
Experiments showed the FPR30 register caused this behavior. Moreover, even if this register don't have side-effect on other systems, over- writing it is also highly questionable, since it was originally configurated by the motherboard manufacturer by hardwiring pull-down resistors to indicate the type of LCD panel. We should not mess with it.
Stop writing to the SR30 (a.k.a FPR30) register.
Signed-off-by: Yifeng Li tomli@tomli.me Cc: stable@vger.kernel.org # v4.4+
Tested-by: Sudip Mukherjee sudipm.mukherjee@gmail.com
-- Regards Sudip